Pressure-filter.



H. REISERT. PRESSURE FILTER. 1,165,124.

APPLICATION FILED APR. 11, 1914.

' I Patented Dec. 21, 1915.

Lyn-"g1 if III.

' E STAS PATENT OFFICE.

HANS BEISERT, 0F COLOGNE, GERMANY, ASSIGNOR TO REISERT AUTOMATIC WATER PURIFYING COMPANY, A CORPORATION OF NEW JERSEY.

PRESSURE-FILTER.

Specification 01 Letters Patent.

Patented Dec. 21, 1915.

Application filed April 11, 1914. .Serial No. 831,183.

vantages which such a construction possesses, and wherein the filter material 15 washed out in part by raw water and in part y purified water, in such manner that only urified water is forced through the secondary bed whereas the primary bed is washed out by the combined wash waters.

"A further object is to discharge the raw wash-water over the secondary bed in such manner as to agitate and open up the upper surface thereof, to assist the washing out of its material.

It is also an object to enable the surface of the secondary bed to .be acted upon in a similar manner by streams or jets of a1r prior to Washing.

With these ends in view the invention may be said to comprise the features of construction and combinations of parts hereinafterdescribed with reference to a preferred illustrative embodiment, and more particularly pointed out in the appended claims.

T he accompanying drawing illustratesthe said embodiment in vertical section.

The construction shown is a pressure filter.

it comprises a tightly closed chamber or tank a, of suitable form, containing primary andsecondary filter bedsm, n supported on perforated shelves 6, c. The primary bed is illustrated as of relatively coarse material and the secondary bed ofrelatively fine material, the secondary bed being of materially less depth than the primary bed. In the fil-' tering operation, raw water to be filtered is supplied over the prlmary bed. and passes first through this bed and then through the secondary bed, the two beds being in series relation. The raw Water arrives under pressure through the pipe 6, and is admitted to the inlet over the bed m through the branch pipe 7. This pipe is controlled by a-ralve I s. The outlet for purified water is {indicated at t at the bottom of the tank, and is secondary, or

in communication with a stand-pipe i of appropriate height. This outlet is controlledbyta valve '11. In the upper part of the tank, above the primary bed, there is also an air vent pipe l'having a valve 79.

A down-take pipe d, of large area within the tank, and a sludge pipe [0, leading from the bottom of the tank in communication with the said pipe d, afi'ord means. for carrying ofi the wash-waters and the impurities held in suspension thereby. The pipe is is secondary filter bed and abovethe bottom of thetank is a space a, constituting a reser- VOlIfiwfOI' holding a certain quantity of the purified water, which is utilized for wa'shing out the secbndary bed. It need not bowever, hold all of the this operation.

vMeans are provided for forcing the purified water back through the secondary bed to cleanse the latter of accumulated 'impurified water used in purities. In the present instance this is effected by the head, dueto the column of water 1n the stand-pipe i, but other means may be employed if desired. Means are also provided for supplying raw wash-water between the beds, to mingle withthewashwater which haspassed through the secondary bed. and therewith proceed upwardthrough the primary bed, cleansing the latter. In the particular construction illus-' 4 traced, abranch q of the raw water pipe 0,

passes through theside of thetank and ter mmates in a distributlng pipe gbetween the beds and adq'acent the top surface of the lower bed. 'This distributing pipe, which may be of any suitable formation, is provided beneath with a multiplicity of smallholes, through which the emer ing' water is directed against the material 0% the sebohdthe valve-0. Means are also providedifor introducing air between the. beds prion tb washing. Thls a r is directed in jets against ary bed so as to loosen and agitate the same from above. The pipe 9 is controlled by the top of the secondary bed to loosen the same. For this purpose the distributing pipe 9 is preferably utilized, being connected with an air injector h having pipes y, 2 leading thereto and each providedwith a valve, as shown. The injector may be of.

an ordinary form in which steam from the pipe 2 entrains air from the pipe 3/.

The left-hand half of the drawing ex-.

hibits conditions during filtering; the righthand half during washing. During the filtering the valve controlling the raw water inlet, and the valve a, controlling the purified water outlet, are open. All other valves are closed. The tank is consequently full of water, which passes under pressure downward through both of the beds to the stand-pipe i and thence to any point or points of delivery. Before washing, the valves 8 and o are closed. The valve 1' of the sludge pipe k and the valve p of the air vent Z'are opened, and the water in the stand-pipe d and in the uppermost portion of the tank above this pipe is allowed to flow out. If air is to be used, the same is forced inby the injector it through the downwardly directed openings of the dis- I tributing pipe 9, against the top of the secthrough the secondary bed. At the same time raw water is being discharged from the distributing pipe 9, and, acting first downwardly upon the surface of the sec-' ondary bed, assists in washing out the latter by loosening the material. -Then mingled with the gwater which has passed upward through the secondary-bed, it flows upward through the primary bed; and the combined wash-waters finally overflow lnto the down-take d and are thence discharged through the sludge pipe. The raw water admitted. between the beds is kept from mingling with the purified water beneath the secondary bed, because the pressure under which the purified water is forced,

backward through the secondary bed is suificiently great to prevent the raw water emerging from the small holes of the dis- I tributing pipe 9 from passing downward entirely through the said secondary bed. Both supplies of wash-water seek the easiest way out, that is to say, through. the downtake (1 and the sludge pipe 70. 'To reco'mmence filteringythe valves 0 and r fareclosed and thej'valvee is'opened. Then after the amiss" escaped from the interiorjof the tank, 'thefva l've'p of the air vent is closed and filterin g' proceeds as before. During washing the air vent is kept open, so that to recommence filtering, the vent permits the air to escape from the interior.

It will be understood that the invention may assume various forms and is not necessarily limited to the embodiment shown.

What I claim as new is:

1. In a filter, the-combination'of a closed chamber containing primary and secondary beds one above the other, and having an inlet for raw water to be filtered and an outlet -for filtered water in its upper and lower portions respectively, means for forcing filtered water back-ward through the secondary bed, means for introducing raw water for washing beneath the primary bed, and an overflow for muddy .wash water comprising a tube extending vertically through the beds with its upper end above the primary bed. r

2. In a filter, the combination of a closed chamber containing primary and secondary beds one above the other, and having an inlet for raw water to be filtered and an outlet for filtered water in itsup'per and lower portions respectively, means for forcing filtered water backward through the secondary bed and for introducing raw water for washing beneath the primary bed,

an overflow for muddy wash water com-- prising a tube of large area extending verticallv throu h the beds with its upper end above the 'orimarv bed, and a normally closed valved outlet communicating with the bottom of said tube.

3.1113, filter, the combination of a closed chamber containing primary and secondary beds one above the other, and having an inlet for raw water to be filtered and an outlet for filtered water in its upper and lower portions respectively, means v for forcing filtered water backward through the secondary bed "and for introducing raw water for washing beneath the primary bed, an

overflow for mudd wash water comprising a tube oflar e area extending vertically through the beds with its upper end above the'primary bed, a normally closed'valved outlet communicating with the bottom of said tube, and a 'valved air'vent communicating with the upper portions of the chamber. 1 v

4. In a filter, the combination of a closed chamber containin rimary and secondary beds one above'the other, and having an inlet for rawwater to be-filtered and an outlet for filtered water in its upperand lower portions respectively, means for forcing filtered water backward through the secondary-bed for washing, piping disposed in 1 the, space between the beds and having jet orifices directed downward upon the surface of the secondary bed, means for altofnately ing a, tube of lame area extending vertically 5- through the-beds" with itsnpper and above the primary bed; and a normally closed valved outlet communicating with fide bottom of said tube. 1 v In testimony whereof, I have signedmy name to thigspeification, in the presence of 10 two subscribmg witneses.

HANSREISERTE 

